Somebody mentioned about the silent screams of fruit being picked (I'm paraphrasing muchly here): There is such a thing as fruitarianism, in which you only eat fruit that has already fallen of the tree. Apparently, they have to live in communes together and it doesn't work very well.
Also, Erin P. said in one of her posts that it as not the killing that was bad, but the cruelty in which the animals lived and died.
I've been a vegetarian scince I was 5, so I forget why I became one, but it was probaly something along the lines of "eating animals is mean
". Interestingly enough, many of my friends back then tried out vegetarianism (although only one stuck with it to my knowledge).